The New Cosmos pp 178-196 | Cite as

Motions and Magnetic Fields in the Solar Atmosphere: Solar Cycle

  • Albrecht Unsöld
Part of the Heidelberg Science Library book series (HSL)


When looked at carefully, the solar surface is seen to be mottled in appearance. The granulation is composed of bright granules the temperature of which exceeds that of the darker interstices by 100° to 200° K. The diameters of the granulation elements range from about 5″ down to the limit of telescopic resolving power at about 1″ corresponding to 725 km on the Sun. From sequences of photographs, the lifetime of a granule is found to be about 8 minutes.


Solar Activity Solar Cycle Solar Atmosphere Solar Radius Solar Limb 
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Copyright information

© Springer-Verlag New York Inc. 1969

Authors and Affiliations

  • Albrecht Unsöld
    • 1
  1. 1.Institute for Theoretical Physics and University ObservatoryKielGermany

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